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curl/lib/warnless.c
Viktor Szakats e9a7d4a1c8
windows: use built-in _WIN32 macro to detect Windows 
Windows compilers define `_WIN32` automatically. Windows SDK headers
or build env defines `WIN32`, or we have to take care of it. The
agreement seems to be that `_WIN32` is the preferred practice here.
Make the source code rely on that to detect we're building for Windows.

Public `curl.h` was using `WIN32`, `__WIN32__` and `CURL_WIN32` for
Windows detection, next to the official `_WIN32`. After this patch it
only uses `_WIN32` for this. Also, make it stop defining `CURL_WIN32`.

There is a slight chance these break compatibility with Windows
compilers that fail to define `_WIN32`. I'm not aware of any obsolete
or modern compiler affected, but in case there is one, one possible
solution is to define this macro manually.

grepping for `WIN32` remains useful to discover Windows-specific code.

Also:

- extend `checksrc` to ensure we're not using `WIN32` anymore.

- apply minor formatting here and there.

- delete unnecessary checks for `!MSDOS` when `_WIN32` is present.

Co-authored-by: Jay Satiro
Reviewed-by: Daniel Stenberg

Closes #12376
2023-11-22 15:42:25 +00:00

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "curl_setup.h"
#if defined(__INTEL_COMPILER) && defined(__unix__)
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
# include <arpa/inet.h>
#endif
#endif /* __INTEL_COMPILER && __unix__ */
#include "warnless.h"
#ifdef _WIN32
#undef read
#undef write
#endif
#include <limits.h>
#define CURL_MASK_UCHAR ((unsigned char)~0)
#define CURL_MASK_SCHAR (CURL_MASK_UCHAR >> 1)
#define CURL_MASK_USHORT ((unsigned short)~0)
#define CURL_MASK_SSHORT (CURL_MASK_USHORT >> 1)
#define CURL_MASK_UINT ((unsigned int)~0)
#define CURL_MASK_SINT (CURL_MASK_UINT >> 1)
#define CURL_MASK_ULONG ((unsigned long)~0)
#define CURL_MASK_SLONG (CURL_MASK_ULONG >> 1)
#define CURL_MASK_UCOFFT ((unsigned CURL_TYPEOF_CURL_OFF_T)~0)
#define CURL_MASK_SCOFFT (CURL_MASK_UCOFFT >> 1)
#define CURL_MASK_USIZE_T ((size_t)~0)
#define CURL_MASK_SSIZE_T (CURL_MASK_USIZE_T >> 1)
/*
** unsigned long to unsigned short
*/
unsigned short curlx_ultous(unsigned long ulnum)
{
#ifdef __INTEL_COMPILER
# pragma warning(push)
# pragma warning(disable:810) /* conversion may lose significant bits */
#endif
DEBUGASSERT(ulnum <= (unsigned long) CURL_MASK_USHORT);
return (unsigned short)(ulnum & (unsigned long) CURL_MASK_USHORT);
#ifdef __INTEL_COMPILER
# pragma warning(pop)
#endif
}
/*
** unsigned long to unsigned char
*/
unsigned char curlx_ultouc(unsigned long ulnum)
{
#ifdef __INTEL_COMPILER
# pragma warning(push)
# pragma warning(disable:810) /* conversion may lose significant bits */
#endif
DEBUGASSERT(ulnum <= (unsigned long) CURL_MASK_UCHAR);
return (unsigned char)(ulnum & (unsigned long) CURL_MASK_UCHAR);
#ifdef __INTEL_COMPILER
# pragma warning(pop)
#endif
}
/*
** unsigned size_t to signed curl_off_t
*/
curl_off_t curlx_uztoso(size_t uznum)
{
#ifdef __INTEL_COMPILER
# pragma warning(push)
# pragma warning(disable:810) /* conversion may lose significant bits */
#elif defined(_MSC_VER)
# pragma warning(push)
# pragma warning(disable:4310) /* cast truncates constant value */
#endif
DEBUGASSERT(uznum <= (size_t) CURL_MASK_SCOFFT);
return (curl_off_t)(uznum & (size_t) CURL_MASK_SCOFFT);
#if defined(__INTEL_COMPILER) || defined(_MSC_VER)
# pragma warning(pop)
#endif
}
/*
** unsigned size_t to signed int
*/
int curlx_uztosi(size_t uznum)
{
#ifdef __INTEL_COMPILER
# pragma warning(push)
# pragma warning(disable:810) /* conversion may lose significant bits */
#endif
DEBUGASSERT(uznum <= (size_t) CURL_MASK_SINT);
return (int)(uznum & (size_t) CURL_MASK_SINT);
#ifdef __INTEL_COMPILER
# pragma warning(pop)
#endif
}
/*
** unsigned size_t to unsigned long
*/
unsigned long curlx_uztoul(size_t uznum)
{
#ifdef __INTEL_COMPILER
# pragma warning(push)
# pragma warning(disable:810) /* conversion may lose significant bits */
#endif
#if ULONG_MAX < SIZE_T_MAX
DEBUGASSERT(uznum <= (size_t) CURL_MASK_ULONG);
#endif
return (unsigned long)(uznum & (size_t) CURL_MASK_ULONG);
#ifdef __INTEL_COMPILER
# pragma warning(pop)
#endif
}
/*
** unsigned size_t to unsigned int
*/
unsigned int curlx_uztoui(size_t uznum)
{
#ifdef __INTEL_COMPILER
# pragma warning(push)
# pragma warning(disable:810) /* conversion may lose significant bits */
#endif
#if UINT_MAX < SIZE_T_MAX
DEBUGASSERT(uznum <= (size_t) CURL_MASK_UINT);
#endif
return (unsigned int)(uznum & (size_t) CURL_MASK_UINT);
#ifdef __INTEL_COMPILER
# pragma warning(pop)
#endif
}
/*
** signed long to signed int
*/
int curlx_sltosi(long slnum)
{
#ifdef __INTEL_COMPILER
# pragma warning(push)
# pragma warning(disable:810) /* conversion may lose significant bits */
#endif
DEBUGASSERT(slnum >= 0);
#if INT_MAX < LONG_MAX
DEBUGASSERT((unsigned long) slnum <= (unsigned long) CURL_MASK_SINT);
#endif
return (int)(slnum & (long) CURL_MASK_SINT);
#ifdef __INTEL_COMPILER
# pragma warning(pop)
#endif
}
/*
** signed long to unsigned int
*/
unsigned int curlx_sltoui(long slnum)
{
#ifdef __INTEL_COMPILER
# pragma warning(push)
# pragma warning(disable:810) /* conversion may lose significant bits */
#endif
DEBUGASSERT(slnum >= 0);
#if UINT_MAX < LONG_MAX
DEBUGASSERT((unsigned long) slnum <= (unsigned long) CURL_MASK_UINT);
#endif
return (unsigned int)(slnum & (long) CURL_MASK_UINT);
#ifdef __INTEL_COMPILER
# pragma warning(pop)
#endif
}
/*
** signed long to unsigned short
*/
unsigned short curlx_sltous(long slnum)
{
#ifdef __INTEL_COMPILER
# pragma warning(push)
# pragma warning(disable:810) /* conversion may lose significant bits */
#endif
DEBUGASSERT(slnum >= 0);
DEBUGASSERT((unsigned long) slnum <= (unsigned long) CURL_MASK_USHORT);
return (unsigned short)(slnum & (long) CURL_MASK_USHORT);
#ifdef __INTEL_COMPILER
# pragma warning(pop)
#endif
}
/*
** unsigned size_t to signed ssize_t
*/
ssize_t curlx_uztosz(size_t uznum)
{
#ifdef __INTEL_COMPILER
# pragma warning(push)
# pragma warning(disable:810) /* conversion may lose significant bits */
#endif
DEBUGASSERT(uznum <= (size_t) CURL_MASK_SSIZE_T);
return (ssize_t)(uznum & (size_t) CURL_MASK_SSIZE_T);
#ifdef __INTEL_COMPILER
# pragma warning(pop)
#endif
}
/*
** signed curl_off_t to unsigned size_t
*/
size_t curlx_sotouz(curl_off_t sonum)
{
#ifdef __INTEL_COMPILER
# pragma warning(push)
# pragma warning(disable:810) /* conversion may lose significant bits */
#endif
DEBUGASSERT(sonum >= 0);
return (size_t)(sonum & (curl_off_t) CURL_MASK_USIZE_T);
#ifdef __INTEL_COMPILER
# pragma warning(pop)
#endif
}
/*
** signed ssize_t to signed int
*/
int curlx_sztosi(ssize_t sznum)
{
#ifdef __INTEL_COMPILER
# pragma warning(push)
# pragma warning(disable:810) /* conversion may lose significant bits */
#endif
DEBUGASSERT(sznum >= 0);
#if INT_MAX < SSIZE_T_MAX
DEBUGASSERT((size_t) sznum <= (size_t) CURL_MASK_SINT);
#endif
return (int)(sznum & (ssize_t) CURL_MASK_SINT);
#ifdef __INTEL_COMPILER
# pragma warning(pop)
#endif
}
/*
** unsigned int to unsigned short
*/
unsigned short curlx_uitous(unsigned int uinum)
{
#ifdef __INTEL_COMPILER
# pragma warning(push)
# pragma warning(disable:810) /* conversion may lose significant bits */
#endif
DEBUGASSERT(uinum <= (unsigned int) CURL_MASK_USHORT);
return (unsigned short) (uinum & (unsigned int) CURL_MASK_USHORT);
#ifdef __INTEL_COMPILER
# pragma warning(pop)
#endif
}
/*
** signed int to unsigned size_t
*/
size_t curlx_sitouz(int sinum)
{
#ifdef __INTEL_COMPILER
# pragma warning(push)
# pragma warning(disable:810) /* conversion may lose significant bits */
#endif
DEBUGASSERT(sinum >= 0);
return (size_t) sinum;
#ifdef __INTEL_COMPILER
# pragma warning(pop)
#endif
}
#ifdef USE_WINSOCK
/*
** curl_socket_t to signed int
*/
int curlx_sktosi(curl_socket_t s)
{
return (int)((ssize_t) s);
}
/*
** signed int to curl_socket_t
*/
curl_socket_t curlx_sitosk(int i)
{
return (curl_socket_t)((ssize_t) i);
}
#endif /* USE_WINSOCK */
#if defined(_WIN32)
ssize_t curlx_read(int fd, void *buf, size_t count)
{
return (ssize_t)read(fd, buf, curlx_uztoui(count));
}
ssize_t curlx_write(int fd, const void *buf, size_t count)
{
return (ssize_t)write(fd, buf, curlx_uztoui(count));
}
#endif /* _WIN32 */
/* Ensure that warnless.h redefinitions continue to have an effect
in "unity" builds. */
#undef HEADER_CURL_WARNLESS_H_REDEFS
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